问题
选择题
There is a new problem involved in the popularity of private cars________road conditions need________.
A．that；to be improved
B．which；to be improved
C．where；improving
D．when；improving
答案
答案：A
考查同位语从句和固定词组。Need doing="need" to be done需要做某事；同位语从句conditions need________.解释名词a new problem